Install additional root certs in UC20 with strict confinement


We are developing a system on Ubuntu Core 20 with strict confinement, and we would like to be able to install additional SSL root certificates that can be picked up by our application snap.

From my research so far, I understand that in a system with strict confinement, application snaps take their root certificates from the core snap, which is read-only. Is there any way of installing certificates in addition to those provided by the core snap?